“I think it is fantastic, and it indicates the openness of even the most traditional corporations to look for leadership from all sources, including from women,” said Marcia D. Greenberger, co-president of the National Women’s Law Center, an advocacy group. “I think it is particularly heartening to see a corporation like GM do that, not only because of the traditional image we have of the male CEO at car companies, but also because of its global reach.”